bdat table

Stores bitmap glyph image data in Apple-format bitmap fonts.

Scope

• Format family: Apple AAT
• Table tag in JSON: bdat

Overview

The bdat (bitmap data) table is Apple's equivalent of the OpenType CBDT/EBDT tables. It stores the actual bitmap glyph image data.

The binary format is identical to CBDT — Font Flux JS delegates parsing and writing to the CBDT implementation.

Specs

• https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6bdat.html

JSON Structure

Same structure as the CBDT table. See that page for field documentation.

Notes

• Always paired with a bloc table (the bitmap locations/index).
• Preserve _checksum for stable round-tripping.
• Validate with .validate() after edits.